Biofeedback is a method of consciously controlling a body function that is normally regulated by the body.  During biofeedback sessions, sensors that are connected to a monitoring device will be attached to your body.  The therapist will teach you the physical and mental exercises that can help you improve your body's functions (i.e. tension, temperature, movement, blood pressure).  The results are displayed on the monitor while you learn how to control that function.  Electromyography (EMG) is one type of biofeedback used to measure the muscle tension while the patient practices relaxation or activation techniques.  Biofeedback requires several sessions in order to build your skills.  Most people can be successful at biofeedback by the time they complete 10 to 12 sessions.